Why Aircon light blinks?

Mitsubishi air conditioners are renowned for their reliable performance and efficient cooling capabilities. However, like any complex appliance, they can sometimes encounter issues. One common problem that users may face is blinking lights on their Mitsubishi air conditioner units. Understanding the meaning behind these blinking lights and knowing how to resolve them can help you restore the optimal functioning of your air conditioner and ensure a comfortable indoor environment. In this article, we will explore the different types of blinking lights on Mitsubishi air conditioners, their possible causes, and provide easy steps for troubleshooting and resolving these issues.

Understanding Mitsubishi Air Conditioner Blinking Lights:

Mitsubishi air conditioners feature indicator lights that can blink in different patterns, indicating various conditions or errors. By understanding these blinking light patterns, you can gain valuable insights into the specific issue at hand. The three main types of blinking lights found in Mitsubishi air conditioners are the power/operation indicator blinking, timer indicator blinking, and error code indicator blinking.

  1. Power/Operation Indicator Blinking: When the power/operation indicator light blinks, it indicates a problem with the power supply or the control board. It’s essential to identify the underlying cause to resolve the issue effectively.
  2. Timer Indicator Blinking: The timer indicator light blinks when there are timer-related malfunctions or incorrect timer settings. Troubleshooting the timer indicator blinking involves checking and adjusting the timer settings to ensure accurate operation.
  3. Error Code Indicator Blinking: The error code indicator light blinks to signal a specific error condition. Each blinking pattern corresponds to a unique error code, which can provide valuable information about the problem. Common causes of error code blinking include refrigerant leaks, airflow restrictions, or sensor malfunctions.

Common Causes of Blinking Lights:

To effectively troubleshoot and resolve blinking light issues in your Mitsubishi air conditioner, it’s crucial to understand the underlying causes. Let’s explore some common causes associated with each type of blinking light pattern:

Power/Operation Indicator Blinking:

  • Power supply issues: Insufficient power supply or faulty electrical connections can trigger blinking lights.
  • Faulty control board: A malfunctioning control board can disrupt the operation of the air conditioner, leading to blinking lights.

Timer Indicator Blinking:

  • Incorrect timer settings: Improperly configured timer settings can cause the timer indicator light to blink.
  • Timer-related malfunctions: Technical issues with the timer function can also result in blinking lights.

Error Code Indicator Blinking:

Refrigerant leaks: Low refrigerant levels or leaks can trigger specific error codes and cause the error code indicator light to blink.

  • Airflow restrictions: Blocked air filters, obstructed vents, or issues with the air circulation can lead to error code blinking.
  • Sensor malfunctions: Faulty temperature sensors or other sensors within the unit can cause error codes and blinking lights.

Troubleshooting and Resolving Blinking Light Issues: 

Now that we have a better understanding of the blinking light patterns and their possible causes, let’s explore some easy steps for troubleshooting and resolving these issues: 

Power/Operation Indicator Blinking:

  • Check power supply and connections: Ensure that the air conditioner is properly connected to a reliable power source. Check for any faulty wiring.
  • Reset the air conditioner: Try resetting the air conditioner by turning it off, disconnecting it from the power supply, waiting for a few minutes, and then reconnecting it. This can help reset the system and resolve minor issues.

Timer Indicator Blinking:

  • Verify and adjust timer settings: Review the timer settings on your air conditioner and ensure they are correctly configured. Make any necessary adjustments to the timer settings according to your preferences.
  • Reset the timer function: If the timer indicator continues to blink, try resetting the timer function on your air conditioner. Refer to the user manual for specific instructions on how to reset the timer.

Error Code Indicator Blinking:

Refer to the user manual: Consult the user manual or manufacturer’s documentation that accompanies your Mitsubishi air conditioner. It should provide a list of error codes along with troubleshooting steps for each specific error.

  • Perform basic checks: Address common causes of error codes, such as checking for refrigerant leaks, ensuring proper airflow by cleaning or replacing air filters, and inspecting vents for obstructions.
  • Contact a professional technician: If you encounter complex error codes or the blinking lights persist despite your troubleshooting attempts, it’s advisable to contact a professional HVAC technician. They have the expertise and tools to diagnose and repair more advanced issues.

Additional Tips for Troubleshooting: 

To prevent blinking light issues in your Mitsubishi air conditioner and maintain its optimal performance, consider implementing the following tips:

  1. Perform regular maintenance: Schedule regular maintenance for your air conditioner, including cleaning or replacing air filters, checking for debris, and inspecting the unit for any signs of wear or damage.
  2. Keep the air filters clean: Clogged air filters can restrict airflow, leading to cooling issues and potential blinking lights. Clean or replace the air filters as recommended by the manufacturer.
  3. Ensure proper airflow and ventilation: Keep the area around the air conditioner unit clear from any obstructions to allow proper airflow and ventilation.
  4. Check for loose connections or wiring issues: Periodically inspect the electrical connections and wiring of your air conditioner for any signs of damage or loose connections. Address any issues promptly to prevent further problems.

When to Seek Professional Help: 

While many blinking light issues can be resolved with the provided troubleshooting steps, some situations may require the expertise of a professional HVAC technician. Consider contacting a professional if:

  • You encounter complex error codes that are not covered in the user manual.
  • The blinking lights persist despite performing the recommended troubleshooting steps.
  • The issue involves electrical or refrigerant-related problems, which require specialized knowledge and equipment.


Understanding the meaning behind blinking lights in your Mitsubishi air conditioner and knowing how to troubleshoot and resolve these issues can save you time, money, and discomfort. By following the easy steps outlined in this article, you can effectively address blinking light issues and restore the optimal functioning of your Mitsubishi air conditioner. Remember to perform regular maintenance, keep the air filters clean, ensure proper airflow, and seek professional help when needed. With these measures in place, you can enjoy the cool and comfortable environment provided by your Mitsubishi air conditioner year-round.

Letscool hotline
Recent bookings

[variable_1] booked [variable_2] [variable_3] ago.

Recent bookings

[variable_1] booked [variable_2] [variable_3] ago.

Message Us on WhatsApp